基于模糊PID前馈控制的VRV空调控制方法研究

A Study on Control Method of VRV Air Conditioner Based on Fuzzy PID Feedforward Control

摘要:

变制冷剂流量（VRV）空调系统由于其舒适性、环保性和节能性得到了广泛的应用，但是系统具有多变量、非线性、强耦合等特点。对于这个问题，在VRV空调系统房间模型基础上，应用仿真实验以及数学建模的方式建立蒸发器过热度、制冷剂质量流量以及电子膨胀阀的数学关系，通过前馈控制满足了有效抵消各蒸发器之间耦合量的需求；通过模糊PID控制器可以体现不同蒸发器之间的耦合关系，同时通过模糊补偿器还可以提高系统建模的精度。最后经过仿真和实验结果发现，经过模糊PID控制以及前馈控制以后，其他房间由于耦合性对于被控房间所造成的的扰动可以被有效抵消，实现了被控房间的稳定运行的目的。通过设计和实验仿真证明了模糊PID控制器的有效性以及前馈模糊控制器良好的控制性。

Abstract:

Variable refrigerant volume (VRV) air-conditioning system with its comfort environmental protection and energy saving characteristics have been a wider range of applications, but the system has features of multivariable, nonlinear and strong coupling. Based on the VRV room model,the mathematical relations of evaporator superheat refrigerant mass flow and electronic expansion valve are established by means of simulation experiment and mathematical modeling. The coupling between evaporators can be offset by feedforward control; The fuzzy PID controller can reflect the coupling relationship between different evaporators and improve the precision of system modeling through fuzzy compensator. Finally, the simulation and experimental results show that after the fuzzy PID control and feedforward control, the disturbance caused by the coupling of other rooms can be effectively eliminated, and the stable operation of the controlled room is achieved. The effectiveness of the fuzzy PID controller and the good controllability of the feedforward fuzzy controller are proved by design and simulation.